Analysis of genetic diversity of phenotypic traits of introduced potato varieties in northern Shanxi province

LU Yao; MAO Xianghong; SHEN Rimin; FAN Xiangbin; BAI Xiaodong

doi:10.16861/j.cnki.zggc.2024.0105

Abstract：In order to identify suitable potato varieties for planting in northern Shanxi province,12 qualitative and 6 quan-titative traits of 42 potato varieties were analyzed for genetic diversity of phenotypic traits,correlation analysis,principal component analysis and systematic clustering analysis. The results showed that the introduced varieties were rich in phe-notypic diversity,and the genetic diversity indices of the quality traits,such as ripeness,flower profusion,potato shape,potato skin type,flesh color and bud eye depth,reached 1.24,1.23,1.59,1.08,1.09 and 1.05,respectively. The genetic diversity indices of the six quantitative traits were around 1.5,with the coefficients of variation ranging from 17.65％-61.00％,with higher coefficients of variation for number of main stems and number of branches. The results of correlation analysis showed that plant height was highly significant positively correlated with stem thickness and number of branches,and significantly positively correlated with number of main stems. Commercial potato yield was negatively correlated with the number of main stems and positively correlated with yield. Principal component analysis determined that the cumulative contribution of the seven principal components was 78.23％. Systematic cluster analysis classified the 42 potato varieties into five groups,group Ⅰ and group Ⅳ were unsuitable for conventional field management and with low resource quality;group Ⅲ were suitable for planting in northern Shanxi province;and varieties in group Ⅴ could be used as breeding parental materials. The results of the study are of great significance in guiding the selection of potato varieties and breeding parental materials in the northern region of Shanxi province.